JP2015122156A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device which inhibits a light emitting module provided in a housing from being broken by electrostatic discharge.SOLUTION: A lighting device according to one embodiment includes: a housing which opens at the one end part side; a light emitting module provided in the housing and having light emitting elements; an outer cover covering an opening of the housing; and an inner cover disposed at a position which is inside the housing and between the light emitting module and the outer cover. A hole, into which a fastening member is inserted, is exposed in the housing.

Description

  Embodiments described herein relate generally to a lighting device.

There is a lighting device that includes a housing, a light emitting module provided inside the housing and having a light emitting diode (LED), and a cover that covers an opening facing the bottom of the housing.
Such an illuminating device is fixed to a wall surface or the like on the mounting side using a fastening member such as a screw. In this case, if the fastening member is visible from the outside, the merchantability of the lighting device will be reduced.
Therefore, a fastening member is provided inside the housing so that the fastening member is hidden by the cover.
However, since the fastening member is hidden by the cover, it is necessary to perform the fastening work with the cover removed when the lighting device is fixed to the wall surface on the attachment side.
Therefore, the light emitting module exposed inside the housing may be destroyed by electrostatic discharge.

JP 2004-322858 A

  The problem to be solved by the present invention is to provide an illuminating device capable of suppressing a light emitting module provided in a housing from being destroyed by electrostatic discharge.

  The lighting device according to the embodiment includes a housing that is open at one end; a light emitting module that is provided inside the housing and has a light emitting element; an outer cover that covers the opening of the housing; and the housing And an inner cover provided between the light emitting module and the outer cover. And the hole which inserts a fastening member is exposed inside the said housing | casing.

  According to the embodiment of the present invention, it is possible to provide an illuminating device capable of suppressing the light emitting module provided in the housing from being destroyed by electrostatic discharge.

It is a schematic plan view for illustrating the illuminating device 1 which concerns on this Embodiment. It is a schematic side view for illustrating the illuminating device 1 which concerns on this Embodiment. It is a schematic cross section for illustrating the illuminating device 1 which concerns on this Embodiment. (A) is a schematic cross section of the inner cover 5 which has a part from which the transmittance | permeability of light differs. (B) is a CC arrow directional view in (a).

The invention according to the embodiment includes: a housing having one end opened; a light emitting module provided inside the housing and having a light emitting element; an outer cover covering the opening of the housing; An illumination device including an inner cover provided inside and between the light emitting module and the outer cover. And the hole which inserts a fastening member is exposed inside the said housing | casing.
According to this illuminating device, when fixing the illuminating device to the wall surface or the like on the mounting side, it is possible to suppress the light emitting module provided inside the housing from being destroyed by electrostatic discharge.

In this case, the inner cover may have translucency and conductivity.
If it does in this way, while being able to permeate | transmit the light radiate | emitted from the light emitting module to the outer cover side, the discharged static electricity can be released.

The inner cover may have light diffusibility.
In this way, glare can be suppressed.

Further, the inner cover may have a first portion and a second portion. The second portion may have a light transmittance higher than the light transmittance of the first portion.
In this way, it is possible to improve the performance by the glittering feeling.

Hereinafter, embodiments will be illustrated with reference to the drawings. In addition, in each drawing, the same code | symbol is attached | subjected to the same component and detailed description is abbreviate | omitted suitably.
Moreover, although the case where the illuminating device 1 which concerns on this Embodiment is a room lamp provided in a motor vehicle etc. is illustrated below, the use of the illuminating device 1 is not necessarily limited to this.
The lighting device 1 according to the present embodiment can be applied to, for example, an indoor lamp provided in a moving body such as a railway vehicle, an aircraft, a ship, an indoor lamp provided in a house, and the like.

FIG. 1 is a schematic plan view for illustrating a lighting device 1 according to the present embodiment.
FIG. 2 is a schematic side view for illustrating the lighting device 1 according to the present embodiment.
2 is a view taken along line AA in FIG.
FIG. 3 is a schematic cross-sectional view for illustrating the lighting device 1 according to this embodiment.
3 is a cross-sectional view taken along line BB in FIG.

As shown in FIGS. 1 to 3, the lighting device 1 is provided with a housing 2, a light emitting module 3, an outer cover 4, and an inner cover 5.
The housing 2 is open on one end side (front side). The appearance of the housing 2 has a staircase shape. The cross-sectional area of the housing 2 in the direction orthogonal to the central axis 1a of the lighting device 1 increases stepwise as the front side of the lighting device 1 is reached.

The most rear side portion of the stepped casing 2 is a bottom portion 2a.
The light emitting module 3 is provided inside the housing 2 and on the bottom surface of the bottom 2a.
The most front side portion of the stepped casing 2 is a flange portion 2c.
The front side of the flange portion 2c, that is, the front side of the housing 2 is open.
A portion between the bottom portion 2a and the flange portion 2c of the stepped casing 2 is an attachment portion 2b. The mounting portion 2b is provided with a hole 2b1 into which a fastening member 20 such as a screw is inserted.
The illuminating device 1 is fixed to the wall surface or the like on the attachment side by a fastening member 20 inserted into the hole 2b1.

The hole 2 b 1 for inserting the fastening member 20 is exposed inside the housing 2.
For example, the hole 2b1 is provided outside a region where an inner cover 5 described later is provided.
Therefore, when the outer cover 4 is removed, the hole 2b1 can be exposed inside the housing 2.
As shown in FIG. 3, the outer cover 4 is provided on the bottom 2 a, and the hole 2 b 1 for inserting the fastening member 20 is provided on the attachment 2 b close to the opening side of the housing 2.
Therefore, the workability at the time of fixing the housing | casing 2 to the wall surface etc. of an attachment side using the fastening member 20 can be improved.

The bottom part 2a, the attachment part 2b, and the flange part 2c can be integrally molded.
Moreover, the bottom part 2a, the attaching part 2b, and the flange part 2c may be formed separately, and they may be joined.
The material of the housing 2 is not particularly limited. The housing 2 can be formed using, for example, a resin material or a metal material.
In this case, the materials of the bottom portion 2a, the attachment portion 2b, and the flange portion 2c may be different from each other.
In addition, a member made of a metal material can be embedded in a predetermined portion by using an insert molding method or the like. For example, a washer made of a metal material can be embedded in the hole 2 b 1, or a ground terminal for grounding can be embedded in an arbitrary position of the housing 2.

Moreover, although the case where the external appearance of the housing | casing 2 was three-step staircase shape was illustrated, it is not necessarily limited to this.
For example, the appearance of the housing 2 can be box-shaped (when only the bottom 2a is provided), or can be two steps or four or more steps.
However, if the cross-sectional area of the housing 2 in the direction orthogonal to the central axis 1a of the lighting device 1 is increased stepwise as it becomes the front side of the lighting device 1, the light reflected by the side surface of the housing 2 It becomes easy to radiate | emit to the front side of the illuminating device 1. FIG. That is, the light extraction efficiency in the lighting device 1 can be improved.

The light emitting module 3 is provided with a substrate 3a and a light emitting element 3b.
The substrate 3a has a plate shape, and a wiring pattern (not shown) is provided on the surface.
There is no particular limitation on the material and structure of the substrate 3a. For example, the substrate 3a can be formed of an inorganic material (ceramics) such as aluminum oxide or aluminum nitride, or an organic material such as paper phenol or glass epoxy. Moreover, the board | substrate 3a may coat | cover the surface of a metal plate with the insulator. When the surface of the metal plate is covered with an insulator, the insulator may be made of an organic material or may be made of an inorganic material.

In this case, when the light emitting element 3b generates a large amount of heat, it is preferable to form the substrate 3a using a material having high thermal conductivity from the viewpoint of heat dissipation. Examples of the material having a high thermal conductivity include ceramics such as aluminum oxide and aluminum nitride, a high thermal conductive resin, and a metal plate whose surface is covered with an insulator.
The high thermal conductive resin is, for example, a resin such as PET (Polyethylene terephthalate) or nylon mixed with fibers or particles made of carbon, aluminum oxide or the like having high thermal conductivity.
The substrate 3a may be a single layer or a multilayer.

A plurality of light emitting elements 3b are provided on the surface of the substrate 3a.
The light emitting element 3b can be, for example, a light emitting diode, an organic light emitting diode, a laser diode, or the like.
Further, the light emitting element 3b may be provided inside the envelope and may have a surface mount type configuration that is electrically connected to the wiring pattern of the substrate 3a via a lead.
The light emitting element 3b may have a COB (Chip On Board) configuration that is bonded to the substrate 3a and electrically connected to the wiring pattern of the substrate 3a via a bonding wire.

In addition, a sealing portion (not shown) that covers the light emitting element 3b can be provided. And the fluorescent substance can be contained in the sealing part which is not illustrated. The phosphor may be, for example, a YAG phosphor (yttrium / aluminum / garnet phosphor).
For example, when the light emitting element 3b is a blue light emitting diode and the phosphor is a YAG phosphor, the YAG phosphor is excited by blue light emitted from the light emitting element 3b, and yellow fluorescence is emitted from the YAG phosphor. Radiated. Then, when the blue light and the yellow light are mixed, white light is emitted from the lighting device 1. In addition, the kind of fluorescent substance and the kind of light emitting element 3b are not necessarily limited to what was illustrated, According to the use of the illuminating device 1, etc., it can change suitably so that a desired luminescent color may be obtained.

The upper surface, which is the light emission surface of the light emitting element 3b, is directed to the front side of the lighting device 1, that is, the outer cover 4 side.
There is no particular limitation on the arrangement of the plurality of light emitting elements 3b.
The arrangement form of the plurality of light emitting elements 3b can be, for example, a regular arrangement form such as a matrix shape or a concentric circle shape, or an arbitrary arrangement form such as uneven distribution in a predetermined region. it can.
In this case, the arrangement | positioning form and number of the some light emitting element 3b can be suitably changed based on the magnitude | size of the outer cover 4, the thickness dimension of the illuminating device 1, required brightness, etc.

Further, the light emitting module 3 can be provided with circuit components such as a power feeding element, a control element, a switch element, and a protection element as necessary.
The power feeding element can be, for example, a connector or a terminal for power feeding from the outside.
The control element can control the lighting state of the light emitting element 3b, for example.
The switch element can be, for example, for switching the power supply state.
The protective element can protect the light emitting element 3b such as a diode, for example.

The outer cover 4 has a plate shape and is provided so as to cover the opening of the housing 2.
The outer cover 4 is provided on the light emission side of the light emitting element 3b.
The outer cover 4 can have a function of reducing the intensity of incident light. For example, the light transmittance of the outer cover 4 can be lowered. If the light transmittance of the outer cover 4 is lowered, glare can be suppressed. Further, if the light transmittance of the outer cover 4 is lowered, the elements provided inside the housing 2 can be hidden.

In order to reduce the light transmittance of the outer cover 4, for example, at least one of the light incident surface and the light emitting surface of the outer cover 4 is subjected to a diffusion process such as blasting or a scattering layer containing a scattering material Can be provided.
In order to reduce the light transmittance of the outer cover 4, for example, the outer cover 4 can be formed of a translucent material including a scattering material.
In this case, the scattering material can be, for example, fine particles having a refractive index different from the refractive index of the base material (for example, a translucent resin material). The scattering material can be, for example, fine particles made of titanium oxide or the like.

In addition, although the flat outer cover 4 was illustrated, it is not necessarily limited to this.
The outer cover 4 can also have, for example, a convex or concave curved shape.
Further, although the outer cover 4 having a rectangular planar shape is illustrated, the present invention is not limited to this.
The planar shape of the outer cover 4 can be appropriately changed according to the planar shape of the housing 2, the design of the lighting device 1, and the like.

  Here, the fastening member 20 is provided inside the housing 2. Therefore, the fastening member 20 can be hidden from the outside by the outer cover 4. If the fastening member 20 can be hidden by the outer cover 4, the merchantability of the lighting device 1 can be improved.

However, since the fastening member 20 is hidden by the outer cover 4, the fastening work by the fastening member 20 cannot be performed in a state where the outer cover 4 is attached.
For this reason, when the lighting device 1 is fixed to the wall surface or the like on the attachment side, the outer cover 4 is removed so that the hole 2b1 of the attachment portion 2b is exposed inside the housing 2.

However, when the outer cover 4 is removed, the light emitting module 3 provided with the light emitting element 3b and circuit components is also exposed.
Therefore, there is a possibility that electrostatic discharge from an operator or a tool may be applied to the light emitting module 3. If electrostatic discharge is applied to the light emitting module 3, the light emitting element 3b and circuit components may be destroyed.
Therefore, in the lighting device 1 according to the present embodiment, the inner cover 5 is provided so that the light emitting module 3 provided in the housing 2 is prevented from being destroyed by electrostatic discharge.

The inner cover 5 is provided inside the housing 2.
The inner cover 5 is provided between the light emitting module 3 and the outer cover 4 and covers the light emitting module 3.
However, a hole 2b1 into which the fastening member 20 is inserted is exposed inside the housing 2.
That is, the inner cover 5 does not cover the hole 2b1 into which the fastening member 20 is inserted.
For example, the inner cover 5 is provided on the bottom portion 2a and does not cover the attachment portion 2b provided with the hole 2b1.
However, the inner cover 5 is not necessarily provided on the bottom portion 2a, and may be provided so as not to cover the hole 2b1.

The inner cover 5 may have no hole in the portion facing the light emitting module 3 or may be provided with a plurality of holes in the portion facing the light emitting module 3.
However, if a hole is provided in the portion of the inner cover 5 that faces the light emitting module 3, a tool or the like may be inserted into the hole.
Therefore, it is preferable not to provide a hole in the portion of the inner cover 5 that faces the light emitting module 3.

The material of the inner cover 5 is not particularly limited as long as it has translucency.
The material of the inner cover 5 can be, for example, a transparent resin such as polyethylene, polyethylene terephthalate, or acrylic.

Further, the inner cover 5 can be conductive.
For example, the inner cover 5 may be subjected to an antistatic treatment.
For example, an antistatic agent or the like can be applied to the surface of the inner cover 5 to form a conductive film.
The inner cover 5 can also be formed using a resin material to which an antistatic agent or the like is added.
When the inner cover 5 is subjected to an antistatic treatment, a wiring 21 that electrically connects the ground terminal provided in the housing 2 and the inner cover 5 can be provided.
In this case, as shown in FIG. 3, one end of the wiring 21 can be brought into contact with the fastening member 20 so that the inner cover 5 is grounded via the fastening member 20.

Moreover, the light transmittance of the inner cover 5 can be lowered. If the light transmittance of the inner cover 5 is lowered, glare can be suppressed. Moreover, if the light transmittance of the inner cover 5 is lowered, it is possible to prevent the portion immediately above the light emitting element 3b from becoming too bright.
In order to reduce the light transmittance of the inner cover 5, for example, a diffusion process such as blasting is performed on at least one of the light incident surface and the light emitting surface of the inner cover 5, or the scattering layer includes a scattering material. Can be provided.
Moreover, the inner cover 5 can also be formed from the translucent material containing a scattering material.
In this case, the scattering material can be, for example, fine particles having a refractive index different from the refractive index of the base material (for example, a translucent resin material). The scattering material can be, for example, fine particles made of titanium oxide or the like.
The inner cover 5 and the outer cover 4 can have light diffusibility, or one of them can have light diffusibility.

Further, the inner cover 5 can be provided with portions having different light transmittances.
4A and 4B are schematic views for illustrating the inner cover 5 having portions having different light transmittances.
FIG. 4A is a schematic cross-sectional view of the inner cover 5.
FIG.4 (b) is the CC arrow directional view in Fig.4 (a).
For example, as shown in FIGS. 4A and 4B, a portion 5a (corresponding to an example of a first portion) and a portion 5b (corresponding to an example of a second portion) are provided. The light transmittance of the portion 5a may be higher than the light transmittance.
For example, the case where the part 5a has the light diffusibility mentioned above and the part 5b is transparent can be illustrated.

If the portion 5b having a relatively high light transmittance is mixed, it is possible to improve the rendering performance due to the glittering feeling.
In this case, the shape, size, arrangement, number, and the like of the part 5b can be changed as appropriate according to the application of the lighting device 1 and the like.
For example, the arrangement of the part 5b may be regular or arbitrary.
Note that portions having different light transmittances may be provided in the outer cover 4.

The inner cover 5 can be provided on the bottom 2 a of the housing 2.
In this case, as shown in FIG. 3, the inner cover 5 can be provided on the bottom surface of the bottom portion 2a.
However, the mounting position of the inner cover 5 is not limited to the bottom surface of the bottom portion 2a. For example, the inner cover 5 can be provided on the side surface of the bottom 2a. For example, the inner cover 5 can be provided so as to fit into the bottom 2a.
Moreover, the inner cover 5 can also be provided in the attachment part 2b and the flange part 2c.
However, when the inner cover 5 is provided on the mounting portion 2b or the flange portion 2c, the inner cover 5 is provided with a hole or a notch so that the hole 2b1 is exposed inside the housing 2.

Moreover, there is no limitation in particular in the fixing method of the inner cover 5. FIG.
For example, the inner cover 5 can be fixed using a fastening member such as a screw. The inner cover 5 can also be fixed using an adhesive or the like. The inner cover 5 can also be fixed using an engaging claw or the like. Moreover, the inner cover 5 can also be fitted and fixed to recessed parts, such as the bottom part 2a.

  As mentioned above, although several embodiment of this invention was illustrated, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, changes, and the like can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and equivalents thereof. Further, the above-described embodiments can be implemented in combination with each other.

  DESCRIPTION OF SYMBOLS 1 Illuminating device, 1a center axis | shaft, 2 housing | casing, 2a bottom part, 2b attachment part, 2b1 hole, 2c flange part, 3 light emitting module, 4 outer cover, 5 inner cover, 5a part, 5b part, 20 fastening member

Claims (4)

A housing that is open at one end;
A light emitting module provided inside the housing and having a light emitting element;
An outer cover covering the opening of the housing;
An inner cover provided inside the housing and provided between the light emitting module and the outer cover;
Comprising
A lighting device in which a hole for inserting a fastening member is exposed inside the housing.   The lighting device according to claim 1, wherein the inner cover has translucency and conductivity.   The lighting device according to claim 1, wherein the inner cover has light diffusibility. The inner cover has a first portion and a second portion,
The lighting device according to claim 1, wherein the second portion has a light transmittance higher than a light transmittance of the first portion.

Images